Cleaning SX 2 I have come across 3 brand new spark plugs ( thought they were used ) along with 100 metre roll of strip chart recorder paper and thought subject may be of interest .The roll fits into my 1960 Furuno 200 Mark -3 fish finder.The pick up (since removed ) was under the hull and sent to the unit which recorded by needle on to the moving paper .It is 30 x 20 x 15cms and weighs about 6 kgs . Has nothing in common with today's lightweight colour units

Hi DavidThe pic really doesn't do it justice .It is a complicated instrument .I have the manual and all technical specs plus the invoice no. but no price .Given that the original boat/motors/trailer cost more than a house and land in Sydney the sounder would have been pricey.I think that their market was professional/trawlers etc.